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Terunuma, Akihiro; Mimura, Ryuji; Nagashima, Hisao; Aoyagi, Yoshitaka; Hirokawa, Katsunori*; Uta, Masato; Ishimori, Yuu; Kuwabara, Jun; Okamoto, Hisato; Kimura, Yasuhisa; et al.
JAEA-Review 2016-008, 98 Pages, 2016/07
JAEA-Review-2016-008.pdf:11.73MB
Japan Atomic Energy Agency formulated the plan to achieve the medium-term target in the period of April 2010 to March 2015(hereinafter referred to as "the second medium-term plan"). JAEA determined the plan for the business operations of each year (hereinafter referred to as "the year plan"). This report is that the Sector of Decommissioning and Radioactive Waste Management has summarized the results of the decommissioning technology development and decommissioning of nuclear facilities which were carried out in the second medium-term plan.
Tsusaka, Kimikazu; Koizumi, Yu*; Tanimoto, Chikaosa*; Kameyama, Katsuhiro*; Miyajima, Yasuyuki*
Tonneru Kogaku Hokokushu (CD-ROM), 18, p.77 - 84, 2008/11
In TBM tunneling, secondary fragmentation is considered as a phenomenon that rock pieces between a cutter head and face are fragmented through the excavation process. The fragmentation should cause damage and excessive wear to the disc cutters which pass through the dome-shaped part where scrapers scoop up muck. Based on the cutter replacement records in four TBM applications through sedimentary and granitic rocks, the authors investigated the difference in the rolling distance per unit disc diameter loss between the inner cutters and the outer ones. As a result, it was clarified that the cutter life at the outer part were shorter than that at the inner part by more than 20% by the secondary fragmentation.
Koizumi, Satoshi; Putra, A.; Zhao, Y.; Noda, Yohei; Yamaguchi, Daisuke; Ueda, Satoru*; Gunji, Hiroyuki*; Eguchi, Mika*; Tsutsumi, Yasuyuki*
no journal, ,
In order to investigate water history during fuel cell operation, we employed deuterated gas (D
) as a fuel (deuterium fuel cell). With exchange of H and D, we aim to perform a contrast variation as for polyelectrolyte film (Nafion). When D gas is used as a fuel, DO is produced at the cathode and diffuses back to the film. Then the film, originally swollen by HO, exhibits change of coherent scattering contrast. By changing a fuel gas from H to D, SANS quantitatively detected decrease of scattering intensity at scattering maximum originating from the ion-channel in the electrolyte. After quantitative analyses on scattering intensity, which is related to water ratio (HO/DO) in the ion channel, we could determine the water ration swelling a membrane.
Shobu, Takahisa; Shiro, Ayumi*; Yasuda, Ryo*; Koizumi, Yasuyuki; Mizutani, Haruki; Kobayashi, Takanori; Muramatsu, Toshiharu
no journal, ,
no abstracts in English
